Adam Jeffson is living his life in the later years of Victorian London when his fiance schemes to give him an opportunity to be part of a voyage attempting to reach the pole for the first time. She is more concerned about the immense reward money, but the series of misfortunes that follows Jeffson to the pole is only the beginning as, after he is the only surviving member of the party to reach the pole, once he starts venturing southward again he finds the world immeasurably changed. He pieces together that a poisonous purple cloud swept across all populated areas, killing off all the large animals on the land, to the point that he finds himself the last living man on earth, and spends twenty years wandering about and going mad.
The style this novel is written in was probably already dated during its original publication; ornate and somewhat obtuse, with the narrator often becoming hysterical in an attempt to heighten the drama. There is certainly a decadent and gothic feel to the book, especially after the disaster as the author seems to revel in the dead bodies of all kinds scattered everywhere.
The book is known as a sort of minor classic of science fiction, but mostly it left me disappointed. The large middle portion where the narrator is by himself is probably the low point, where he indulges in all sorts of pointless activity without much of the inner reflection you might expect when you are given so much time alone. I found myself glazing over pages at a time without really picking up on anything that might have happened, and ended up finishing the book just to say that I did.
There are a few versions of this novel, the longest original serialized version, the shorter version afterward published in novel form, then a revised version from 1929 which is in between the previous two in terms of length. This is the final, 1929 version.